There IS a reason the hdy fluid is low on the rear. The only place for it to go is through the accumator seals or the tank that holds the fluid. My guess is the accumators. Even so, there will be NO fluid on the ground as it leaks throught the seal into another part of the accumators. If and when you replace them, replace both. They run 150 or so each plus 150 to install them. If the car is bouncy in the rear they are bad. If to seems to not take a corner turning one way than the other, you have one bad one. Remember to always replace both as the hdy fluid circulates through both and back to the res as that is where the pump is.

__________________
Porsche's for Breakfast & Ferrari's for Lunch